biology lab
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17 terms
Terms | Definitions |
|---|---|
 solvent | water is reffered to this and it dissolves other things |
| solutes | while water doesn't dissolve everything, molecules (like sugar) that enter into suspension are |
| plasma membrane | cell are surrounded by this and among its myriad functions, serves as a selectively permeable membrane |
| selectively permeable membrane | it allows the passage of some materials and impedes the passages of others |
| concentration gradient | when there is a difference in molecule concentration between two adjacent areas |
| diffusion | the movement of molecules from an area of high concentration to an area of lower concentration |
| osmosis | which water moves from an area of high to low concentration |
| hypertonic | humans can't utilize saltwater as a source of water since it is so high in solutes, this is called |
| hypotonic | we are this, (lower solute concentration), with respect to saltwater |
| isotonic | if we drink something with the exact same amount of solute as us |
| passive transport | all life is subject to the tenents of selection, thus seeks to maximize energy efficiency and decrease energy expenditures, some types of transportation cost nothing for the cell |
| the more energy you have for other endeavors | the more passive transport you engage in, |
| facilitated diffusion | these proteins act as channels through which molecules that are too large or charged move, all without the expenditure of precious energy |
| against | there are some molecules that you really want in your cells, but must move __ a concentration gradient |
| active transport | for these molecules, you have to spend energy (in the form of ATP), takes precious energy away is called |
| plasmolysis | water exiting the plant cell, the result is a wilted, droopy, vegetative appendage |
| hemolysis | a red blood cell lacking the cell wall of a plant, has only a thin membrane preventing it from swelling to epic proportions before lysing as water enters the cell |
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